There seem to be two sets of sounds - the clicks that sound like mic handling noise aren't at the end, so I'm not sure if they were what you were telling me to ignore. They're certainly much closer to the mic than the other, continuous noise, in fact I think they're very close.
The other noise - is it definitely animal? - How long was the noise? - continuous or in short bursts like your sample? - it sounds rather like a motor - could even be something like a compressor, transmitting through the hull of a boat. There seems to be some reverberation there which I assume results from the source-mic distance (and certainly it doesn't sound like very deep water) but it could be be structural reverberation if it actually came from an object with a rigid body such as a boat.
I'll be happy if you find out what it is!
Regards
ppl
Dr Peter Lennox
Director of Signal Processing and Applications Research Group (SPARG)
School of Technology,
Faculty of Arts, design and Technology University of Derby, UK
p.lennox@xxxxxxxxxxx
(01332) 593155
http://sparg.derby.ac.uk/SPARG/Staff_PLX.asp
-----Original Message-----
From: AUDITORY - Research in Auditory Perception [mailto:AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of Linda Sebastianutto
Sent: 10 December 2009 14:43
To: AUDITORY@xxxxxxxxxxxxxxx
Subject: Unknown biological sound
Dear list members,
During a nocturnal acoustic survey in shallow waters in the Northern
Mediterranean Sea my colleagues recorded some strange sounds of
unknown origin.
You can find an example in attachment; it is band-pass filtered (50 -
600 Hz), and amplified. Please try to ignore the "clicks" at the end
of the sound.
Does any of you have an idea of what kind of animal emits a sound like
this? Maybe a fish?
Thank you in advance
L Sebastianutto
Linda Sebastianutto, PhD student
Cognitive Neuroscience Sector
International School of Advanced Studies
via Lionello Stock 2/2
Trieste - Italy
email: sebast@xxxxxxxx
tel: +39 040 3787604
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